Day3

# Part 1
[string[]]$rucksacks = $puzzleInput -split '\n' | Select -SkipLast 1
$rucksack = $rucksacks[0]
$allByteValues = foreach ($rucksack in $rucksacks) {
    $firstCompart = $rucksack.Substring(0,$rucksack.Length/2)
    $secondCompart = $rucksack.Substring($rucksack.Length/2)
    $duplicateObj = Compare ($firstCompart.ToCharArray() | group).Name ($secondCompart.ToCharArray() | group).Name -ExcludeDifferent -IncludeEqual -CaseSensitive
    [char]$duplicateChar = $duplicateObj.InputObject
    if ($duplicateChar -cmatch '[a-z]') {
        $bval = ([byte]$duplicateChar) - 96
    }
    else {
        $bval = ([byte]$duplicateChar) - 38
    }
    $bval
}
($allByteValues | Measure -Sum).Sum

# Part 2
$elfCount = 0
$allByteValues = foreach ($rucksack in $rucksacks) {
    $elfCount++
    if ($elfCount % 3 -ne 0) {
        continue
    }
    $elfGroup = $rucksacks[$($elfCount-3)..$($elfCount-1)]
    $firstTwo = (Compare ($elfGroup[0].ToCharArray() | group).Name ($elfGroup[1].ToCharArray() | group).Name -ExcludeDifferent -IncludeEqual -CaseSensitive).InputObject
    [char]$foundChar = (Compare $firstTwo ($elfGroup[2].ToCharArray() | group).Name -ExcludeDifferent -IncludeEqual -CaseSensitive).InputObject
    if ($foundChar -cmatch '[a-z]') {
        $bval = ([byte]$foundChar) - 96
    }
    else {
        $bval = ([byte]$foundChar) - 38
    }
    $bval

}
($allByteValues | Measure -Sum).Sum